Kukpowruk River 96-26 (Cretaceous to of the United States)

Also known as Kukpowruk River/Cape Lisburne floras

Where: western North Slope County, Alaska (69.3° N, 162.4° W: paleocoordinates 79.0° N, 95.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Corwin Formation, Albian to Albian (113.0 - 93.9 Ma)

• middle Albian to Cenomanian

• group of beds-level stratigraphic resolution

Environment/lithology: crevasse splay; concretionary, brown, gray, silty mudstone and fine-grained, gray, yellow sandstone

• Description. Sequence of grey/brown, silty mudstones with ironstone

•nodules, coals, and fine-grained (rarely medium-grained) grey/

•yellow sandstones. Phoenicopsis is abundant throughout and is the

•only common plant fossil in the sandstones. Very large-leafed

•Ginkgo ex gr. adiantoides, Desmiophyllum magnum, Birisia and

•Pagiophyllum triangulare occur in the mudstones.

•Interpretation. Channel sands and near-channel crevasse splay sands

•alternating with interfluve floodplain silts and muds with occasional


Size class: macrofossils

Collection methods: quarrying,

• Material stored at the Earth Sciences Department, The Open University, collection # 96 RAS.

Primary reference: R. A. Spicer and A. B. Herman. 2001. The Albian-Cenomanian flora of the Kukpowruk River, western North Slope, Alaska: stratigraphy, palaeofloristics, and plant communities. Cretaceous Research 22:1-40 [D. Royer/D. Royer/D. Royer]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 34386: authorized by Dana Royer, entered by Dana Royer on 28.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Bennettitales -
Pseudocycas sp. Nathorst 1907
 Pinales - Podocarpaceae
 Pinales - Araucariaceae
Pagiophyllum triangulare
occurs in mudstones
 Pinales -
Desmiophyllum magnum
occurs in mudstones
Desmiophyllum sp. Lesquereux 1878
 Equisetales - Equisetaceae
 Czekanowskiales -
Phoenicopsis ex gr. angustifolia
most common throughout deposit; common in sandstones
 Cyatheales - Dicksoniaceae